1.1. Bad dreams occurring during REM. Children have more nightmare than adults as they spent majority of their time in REM. Adults can still suffer from adults
2. Insomnia
2.1. The inability to sleep, or sleep well. Psychological causes are worrying and anxiety. Physiological causes too much caffeine, and indigestion. c
3. adaptive theory
3.1. Animals and Humans adapted sleep patterns to protect themselves from those hunting (Predators)
4. Restorative Theory
4.1. Sleep is necessary for health. Sleep helps repair the chemical balances in our bodies and the cell damage if any.
5. sleep deprivation
5.1. Loss of sleep. resulting in irritability and focus. a serious problem especially for drivers.
6. REM (Rapid eye movement) Sleep
6.1. Active Sleep when someones dreams take place. muscles relax. person moves little in this sleep
7. Non Rem (NREM) sleep
7.1. a deep restful sleep. these are those people who are "wild sleepers". they tend to kick the one they share a bed with
8. alpha waves
8.1. relaxation brain waves
9. beta waves
9.1. small fast brain waves shows mental activity
10. REM behavior disorder
10.1. nightmares that can come true due to muscle failure during slumber.
11. microsleeps
11.1. small bursts into slumber only lasting a few seconds.
12. Circadian Rhythm
12.1. sleep wake cycle. this is controlled by the brain
